Water Softener + Whole House Carbon Filter - Help with Proper System Selection

I decided to put in a whole house carbon filter + water softener system for my home. I am putting it outside, next to my water heater. Plumbing loop has already been installed and outside house hose bibs have been plumbed for raw water only. I also measured GPM from my tub and filled a 5 gallon bucket and calculated 1.22GPM (49 secs to fill 5 gallon bucket).

I have done some research and have spoken to more than a few water treatment companies. I am looking at either US Water Systems Fusion NLT Hybrid OR Clack WS1 System (details below). Do I really need a 53000 grain (15 GPM unit)? I was told it would be more efficient due to less regenerations and there would be less strain on the system. Not sure how true this is.

I am having a hard time choosing a carbon + water softener system. Please help.

Water delivered to customers in the Southwest System is a blend of groundwater pumped from the West and Central Coast Groundwater Basins and imported water from the Colorado River Aqueduct and the State Water Project (imported and distributed by Metropolitan Water District of Southern California).

Units come with the standard 8% cross link resin not 10%. I would question why. There's something not right because 10% cost more and the online dealers have to fight hard for your business. Adding cost to their product (even pennies) may mean the difference of making a sell or not. Underbedding is important in your case. Mazke sure you get it with your system.

Units come with the standard 8% cross link resin not 10%. I would question why. There's something not right because 10% cost more and the online dealers have to fight hard for your business. Adding cost to their product (even pennies) may mean the difference of making a sell or not. Underbedding is important in your case. Mazke sure you get it with your system.